Attachment for stoping-drills



M. R. VALENTINE AND W. S. BRUNER.

ATTACHMENT FOR STOPING DRILLS.

APPLICATION FILED MAR. 7| l9l9.

- Patented Nov. 23, 1920.

' INVENTOR5. f2 l /emme 6/70 6. Bra/7e.

ATTORNEY.

all

UNl'l'tEB SEAT-ES PATENT rinciq MALVERN a. VALENTINE, or vreroaaivn wILLiAM s. BRUNER, or CRIPPLE CREEK,

' COLORADO. I

ATTACHMENT FOR STOPING-DRILLS.

TINE and WILLIAM S. BRUNER, citizens of the United States,-residing, respectively, at

Victor and Cripple Creek, in the county of Teller and State ofColorado, have invented certain new and useful Improvements in Attachments for Stoping-Drills, of which the following is a specification.

This inventlon relates to improvements in stoping drills, and its primary object is.

to provide a brake which automatically arrests longitudinal movement ofthe air feed cylinder of a drilling machine of this character, by frictional contact. with a stoping bar extending through an end thereof, when by breakage of a drill. steel or other accidental cause, the cylinder is suddenly projected by expansionof the air which feeds it to the work. y

Our invention is preferably embodied in an attachment which may be applied to the air-feed cylinders of drills already in use, without material changev in the construction or arrangement'of the same. I By the use of ourinvention violent displacement of air-feed drilling machine when by breakage of the drill orother causes the resistance to the pressure of the. air which holds it to the work is suddenly removed, are

effectively avoided, and the danger of acci-.

dentsby contact of the forcibly projected parts is reduced to the minimum.

An embodiment of our'invention is shown in the accompanying drawlngs' in the vaf rious views of which like parts are similarly designated, and in which- Figure 1 represents a stoping working position; Fig. 2, a sectional elevation of the lower part of the extensible column of the machine I drawn to an enlarged scale; I

Fig. 3, a section taken on the line 3-3, Fig. 2, and

Fig. 4, a section similar to'that of Fig. 3 partially in elevation, showing the position of the moving parts of the brake in its acdrill in its tive condition. I

V Referringto the drawings by numerical reference characters 2 designates the barrel of an air-driven stoping drill which is Specification of Letters Patent.

, tached.

. the cylinder. 1

1919. Serial No. 2s1,2ss.

mounted upon the longitudinally extensible column 3.

Patented Nov. 23, 19, 20. I

A drill-steel 4 held in a chuck at the end I of the barrel is driven by a reciprocating plston-hammer 5 nd a valve 6 between the drill proper and the extensible column admits air supplied through a hose-connection, 7, for the operatlon of the 'pistomhammer and for feeding the machine by gradualextension of the column.

.The-construction of the valve and other parts of the operating mechanism ofthe drlll is too well known to require further description or detailed illustration, it being understood that our invention is applicable to any drilling machine which by-the expansion of a body of air under pressure is connected with thev'd rill barrel through the intermediary of a head in which the valve 6 1s fitted and to which the; air-hose is at- .Astoping bar 10 projecting through the lower end of the cylinder has a piston head 12' which fits slidinglv within the same and a nut'13 attached to the cylinder at its lower end provides a guiding passage for the bar.

The parts. of our invention are completely assembled on the above-mentioned nut'so thatforits application to .a drilling machine already in use it is only required to remove the nut, plug or bushing which closes the feed-cylinder, and attach the, nut

, which carries the automatic brake. by means of an external screw thread on the end of' On cylinders originally closed by. a nut the same screw-thread may be used for securing the attachment, but on those which are closed bv a threaded. bushing or plug, a new screw-thread must be out upon the exterior of the cylinder to attach the nut which carries the brake.

*A ring 14, interiorly of tapering section,

A link 15 pivotally secured between ears 16 on the ring and corresponding ears 1701i the nut B, provides a hinge connection by which the ring is attached to the nut .ror

downward motion to clampingly engage the stoping bar wh'ich'when the ring is in its normal inactive position, has a free sliding movement therein. 7

The ring is yieldingly held in its normal position bymeans of two spring-latches 1-8 which are attached at one of their ends in recesses at opposite sides "of the -"nut and which at their other ends lie in shallow in "dentations in correspondingly formed 'relatches, when the drilling machine is moved downwardly on the stoping bar to resume its operation.

The collar also prevents displacement of the brake ring while the machine is being moved about.

In the operation of the drill, air is con stantly admitted to the piston head of the stoping bar for the purpose of feeding the drilling machine to the work engaged by the head of its steel, by a relatively longitudinal movement of the feed cylinder upon which the machine is mounted.

When by breakage of the drill steel or other cause, the resistance to theexpansion of the body of compressed air working upon the pistonheadis suddenly eliminated, 'the violent impulse imparted to the feed cylinder' causes the latches to release the ring which in consequence'drops to an oblique position around the stopingbar, as shown in Fig. 4 of the drawings, and by clamping engagement therewith, arrests the outward motion of the cylinder.

The link connection causesfthe ring to 3 engagethe bar simultaneously at diamet- 'r'1cally opposite sides of its interior r dge and-"any increase in the pressure by which the cylinder is propelled will intensify th braking action.

' Having thusde'scribed our invention what -we claim and desire to secure by Letters- Patent is:

1. In a stoping-drill, the combination with an air-feed cylinder and a stoping bar having a piston therein, of a ring hingedly connected with the cylinder and adapted to arrest alongitudinal movement of the same by clampingly engaging the bar, in an oblique position, andmeans to loosely hold the ring in a coaxial position on-the cylinder.

2. In a stoping-drill, the combination with an air-feed cylinder and'a stoping bar having a piston therein, of a ring hingedly .connected with the cylinder and adapted to arrest a longitudinal movement of the same by clampingly engaging the bar, in an oblique position, and a spring-latch to 'loosely h-oldnthe ring in a coaxial position on the cylinder.

3. In ,a stoping-drill, the combination with an air-feed cylinder and a stoping bar having apis'tontherein, of a ring normally coaxial with the cylinder at an end thereof, and a link hingedly connecting the ring to the cylinder so as to permit of its movement to an oblique position by which to clampingly engage the bar.

4. In a stoping-drill, the combination with an air-feed cylinder and a stoping bar "having a piston therein, of a 'ring of "interiorly tapering section, hingedlyconnected with the cylinder and-adapted to arrest a longitudinal movement of the same by clampingly engaging the bar, in an oblique position, and means to loosely holdthe ring on the cylinder in spaced relation t'o'thejbar.

5. An attachment for stoping-drillacomprisinga nut adapted for connection at'the'-- end ofthe air-feed cylinder "thereof, a ring normally coaxial atm'an end of the nut, a hinge-connection between the ring and the nut, and a latch yieldingly holding'the ring in its normal position. 7

6. An attachment forstopmg-drills, comprising a nut adapted for'connec'tion at the end of the air-feed'cylinder thereof, a ring normally coaxial at an end of the nut, a

link hingedly connectin'gthe ring to thenut, I

and a .latch yieldingljy holding the ring in its normal "position. a

,7. An attachment for stoping-drills, comprising a nut adapted for connection at the axial at an end of the-nut, a hinge-connection between the ring and "the "nut, and a latch yieldin ly holding "the "r-ing i n its normal position.

end of the air-feed cylinder the'reofga ring oi interiorly tapering section, normally {co- -s. "In stoping drill, "the "cbmbinafibh' with an air-feed-cylinder and a'st'oping-bar having a piston 'therein,.'of a ring hmgedly connected with the cylinder and adapted-to arrest a longitudinal movement of the same by c lampin'gly engaging the bar; in an oblique positionya latch to loclr the r ngfin a coaxial position on the cylinder, and a collar on the stoping bar, whichiengages the ring in its locked position.

9. In a drilling machine, in combination,

a feed cylinder, a stoping barmovable with relation thereto, a brake on the cylinder, adapted to arrest the relative movement of the stoping bar, and means for holding the brake in an inoperative positiom 'adapted to release the same by sudden movement of the loosely hold the brake on the cylinder, in cylinder. V spaced relation to'the ,bar and to release the 10. In a drilling machine, in combination same by sudden movement of the cylinder. 10 a feed cylinder, a stoping bar movable with n testimo y w e eof We have a fi ed our 5 relation thereto, a brake on the cylinder signatures.

adapted to move into frictional contact With MALVERN VALENTINE. I the stoping bar, and means adapted to WILLIAM S. BRUNER. 

